kernel upgrade held back

[Robert Heller]

At Thu, 9 Jul 2015 15:23:00 +0100 "Ubuntu user technical support,  not for general discussions" <ubuntu-users at lists.ubuntu.com> wrote:

> 
> If I do:
> 
> sudo apt-get update
> sudo apt-get upgrade
> 
> I get:
> 
> The following packages have been kept back:
>   linux-headers-generic linux-signed-generic linux-signed-image-generic
> 
> What might be the reason for this?  As far as I know there are no broken
> packages.

It has to do with version numbers.  Doing a 'plain' apt-get upgrade only 
upgrades packages whose main version numbers don't change.  If you use the 
'dist-upgrade' command:

sudo apt-get dist-upgrade

Packages whose main version numbers do change will be updated.  Typically this 
will be kernel updates, but might apply to other packages from time to time.

> 
> Also, the software updater progress window just closes when it tries to
> install these security upgrades.
> 
> - Richard

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